CN104174279A - Bipolar corona discharge flue gas desulfurization and dust removal method and equipment - Google Patents
Bipolar corona discharge flue gas desulfurization and dust removal method and equipment Download PDFInfo
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- CN104174279A CN104174279A CN201410392051.3A CN201410392051A CN104174279A CN 104174279 A CN104174279 A CN 104174279A CN 201410392051 A CN201410392051 A CN 201410392051A CN 104174279 A CN104174279 A CN 104174279A
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Abstract
The invention discloses a bipolar corona discharge flue gas desulfurization and dust removal method and equipment. A plurality of atomizing nozzles are vertically and fixedly mounted at the top of a flue gas desulfurization absorption tower, the upper end of each atomizing nozzle is connected with a centrifugal pump positioned outside the flue gas desulfurization absorption tower by virtue of a voltage stabilizing valve, and the centrifugal pump is connected with a liquid storage tank for containing desulfurizer slurry. A horizontal corona discharge electrode is arranged under each atomizing nozzle, and all the corona discharge electrodes are connected in series together and then connected with a negative high-voltage electrostatic generator. The left side wall of the flue gas desulfurization absorption tower is connected with a flue gas corona discharge treatment chamber, and the flue gas corona discharge treatment chamber is connected with a flue gas generation device through a pipeline. A bur electrode is arranged in the flue gas corona discharge treatment chamber, and the bottom of the bur electrode is coaxially and fixedly connected with a motor and connected with a positive high-voltage electrostatic generator through a conducting wire. The method and the equipment can be used for respectively processing flue gas and slurry, the flue gas and the slurry can have electric charges with different polarities and then are contacted and mixed, and thus the purpose of improving absorption efficiency is achieved.
Description
Technical field
The present invention relates to flue gas and process and purification techniques, equipment and the method for specifically flue gas being carried out desulfurization and dedusting processing
.
Background technology
A large amount of fire rows of fossil fuel are emitted a large amount of SO
2, NOx and CO
2deng pernicious gas and a large amount of fine particulates, wherein, SO
2, NOx can cause acid rain etc. to cause serious destruction to ecological environment etc., and in particle, a large amount of submicron particles things easily enter human lung by respiratory tract, cause serious respiratory disease.Now a large amount of flue gas desulfurization and denitrifications and cleaner, although can improve the clean level of fume emission, also consumed large energy and water resource simultaneously.At present, main by increasing absorbent ratio, improving sprinkle density and pass through methods such as absorbent chargings to improve SO in flue gas
2, NOx and Submicron Particles removal efficiency and dust collection efficiency.Also have the technology such as charged dry type flue gas desulfurizing, charged active synergy and electrostatic precipitation, be all to adopt the way of extra electric field to improve the utilization rate of absorbent, thereby improve smoke desulfurization efficiency and dust collection efficiency.In addition, by electric field, magnetic field, sound field and gravitational field or centrifugal force field etc., fine particulates is carried out to coalescence processing in addition, its average grain diameter is increased, recycling electric precipitation is collected.The equal cost of above technology is high, operation is complicated, and smoke desulfurization efficiency does not reach expected effect.
Chinese invention patent number is that the patent documentation of ZL200410066936.0 discloses a kind of bipolar corona discharge soot coalescence electro dust removing method and equipment, proposed the ultrafine dirt particle in ash-laden gas by positive and negative corona discharge region, after making it be with positive and negative charge, mutual coalescence gathering becomes larger particles, input again electric cleaner and carry out electric precipitation, its equipment is extremely complicated, implement difficulty larger, after the electric discharge of employing corona electrode, easily produce again knot ash, be unfavorable for lasting corona discharge.Chinese invention patent number discloses a kind of swirling inlet type electrostatic spraying wet flue gas desulphurization dedusting apparatus for the patent documentation of ZL201110145966.0, adopt the charged mode of absorbent slurry to improve the atomizing effect of slurries, and make droplet charged, by increasing extra mass transfer power, obtain higher desulfurized effect, and reach the object of saving water resources consumption, but it only responds to charged processing to droplet, in actual motion, respond to and chargedly due to insulation difficulty, often cause charged unstable; And it only carries out charged processing to droplet, flue gas is not carried out to charged processing, when droplet contacts with flue gas, alternate mass transfer force is not enough.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art; a kind of efficient bipolar corona discharge FGD dust collection method is provided; to the oxysulfide in flue gas, fine particulates and absorbent granules or droplet, adopt respectively opposite polarity electrode to carry out charged processing simultaneously; be conducive to improve mass transfer force, after mixing, can improve absorption efficiency.The present invention also provides a kind of bipolar corona discharge flue gas desulfurization device of realizing said method, and this equipment cost is lower, and the more simple absorbent charging desulfuration efficiency of smoke desulfurization efficiency is high.
The technical scheme that a kind of bipolar corona discharge flue gas desulfurization and dedusting of the present invention equipment adopts is: be provided with a fume desulfurating absorption tower, fume desulfurating absorption tower bottom is that a plurality of atomizers are vertically fixedly equipped with at waste pulp pond, top, the upper end of each atomizer all connects through a pressure maintaining valve centrifugal pump that is positioned at fume desulfurating absorption tower outside, and centrifugal pump connects again the fluid reservoir that desulfurizer slurry is housed; It under each atomizer, is the corona discharge electrode of a horizontal positioned, each corona discharge electrode forms by ring electrode and needle electrode, the uniform identical needle electrode that several are radially arranged along the circumferential direction on the internal ring wall of ring electrode, all needle electrodes have gap in this one end near ring electrode central shaft; Between adjacent two corona discharge electrodes, there is gap, after all corona discharge electrodes are cascaded, connect the negative high voltage electrostatic generator that is positioned at fume desulfurating absorption tower outside; The left side wall of the fume desulfurating absorption tower between corona discharge electrode and waste pulp pond connects flue gas Corona discharge Treatment chamber by left air channel, flue gas Corona discharge Treatment chamber also connects smoke generating appts by pipeline, the indoor arista electrode that is equipped with of flue gas Corona discharge Treatment, arista electrode bottom is coaxially fixedly connected with motor, and arista electrode is connected with the positive high voltage electrostatic generator that is positioned at flue gas Corona discharge Treatment outdoor through wire; Arista electrode is comprised of metal cylinder and raised structures, along axially upper uniform a plurality of raised structures of metal cylinder; The right side wall of the fume desulfurating absorption tower between corona discharge electrode and waste pulp pond is connected with chimney by right air channel.
The technical scheme that a kind of bipolar corona discharge FGD dust collection method of the present invention adopts is to contain following steps:
A, unlatching centrifugal pump, pressure maintaining valve and negative high voltage electrostatic generator, fluid reservoir is carried the desulfurizer slurry of identical atomizing pressure to atomizer, slurries form uniform slurries droplet and fall through atomizer atomization, corona discharge electrode forms corona discharge simultaneously, and the slurries droplet falling is carried out to negative corona discharge processing;
B, open smoke generating appts and positive high voltage electrostatic generator, smoke generating appts produces contains SO
2the flue gas of gas enters flue gas Corona discharge Treatment chamber, and rotation motor drives arista electrode rotation simultaneously; Arista electrode is to containing SO
2the flue gas of gas carries out positive corona discharge processing, and the flue gas after processing enters fume desulfurating absorption tower, interacts with the slurries droplet of processing through negative corona discharge, completes absorption process;
After entering chimney, flue gas after C, absorption discharges SO in flue gas
2the slurries droplet of gas falls into waste pulp pond.
The present invention adopts the advantage having after technique scheme to be:
1. the present invention adopts method difference smoke treatment and the slurries droplet of corona discharge, make it with the electric charge of opposed polarity, then make both contact mixing, the effect of the Coulomb force that is conducive to pass through improves active force between the two, reaches the object that improves absorption efficiency.
2. the present invention processes slurry spraying by corona discharge, improved the atomizing effect of slurries, reduced the average grain diameter of slurries droplets, can bring out the internal flow of droplet, under identical slurry flow, the total body surface area that increases slurries, the increase of droplet total body surface area and internal flow can increase droplet and SO
2mass-transfer efficiency, improved assimilation effect.
3. the present invention carries out flue gas processing by corona discharge, not only can remove the SO in flue gas
2, can remove other sour gas and fine particulates simultaneously, realize the integrated application of multiple effect, reach the object of gas cleaning.
4. the present invention adopts the cuspidated integrally rotated arista electrode of tool, can effectively prevent and treat the dust stratification of corona discharge electrode, reaches the effect of deashing.
5. the present invention's calcium sulfur ratio used is lower, at calcium sulfur ratio, is can obtain more satisfied desulfuration efficiency between 1.0～1.2 time.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of bipolar corona discharge flue gas desulfurization and dedusting of the present invention equipment;
Fig. 2 is the structure enlarged drawing of single corona discharge electrode in Fig. 1;
Fig. 3 is the structure enlarged drawing of arista electrode in Fig. 1.
In figure: 1. smoke generating appts; 2. positive high voltage electrostatic generator; 3. flue gas Corona discharge Treatment chamber; 4. arista electrode; 5. negative high voltage electrostatic generator; 6 fume desulfurating absorption towers; 7. corona discharge electrode; 8. atomizer; 9. pressure maintaining valve; 10. centrifugal pump; 11. fluid reservoirs; 12. chimneys; 13. waste pulp ponds; 14. demisters; 15. valves; 16 shaft insulations; 17 motors.
The specific embodiment
Referring to Fig. 1, a kind of bipolar corona discharge flue gas desulfurization and dedusting of the present invention equipment is provided with a fume desulfurating absorption tower 6, has atomizer 8, corona discharge electrode 7 and waste pulp pond 13 in fume desulfurating absorption tower 6.The bottom of fume desulfurating absorption tower 6 is waste pulp pond 13, a plurality of atomizers 8 are vertically fixedly equipped with at the top of fume desulfurating absorption tower 6, atomizer 8 is pressure atomized fog jet (also other forms of nozzle can be installed), the upper end of each atomizer 8 is equipped with a pressure maintaining valve 9, pressure maintaining valve 9 is positioned at the outside of fume desulfurating absorption tower 6, under each atomizer 8, be the corona discharge electrode 7 of a horizontal positioned, corona discharge electrode 7 is 0～50mm with the vertical range of atomizer 8 lower ends.In actual corona discharge process, atomizer 8 is one end of corona discharge electrode 7, and its electromotive force is zero.
Corona discharge electrode 7 is made for brass material, between adjacent two corona discharge electrodes 7, will keep certain interval, and control punctures medium in corona discharge.After being cascaded, all corona discharge electrodes 7 connect by thering is the wire of sterilization crust the negative high voltage electrostatic generator 5 that is positioned at fume desulfurating absorption tower 6 outsides.
Outside the atomizer 8 extended fume desulfurating absorption towers 6 in upper end, connect centrifugal pump 10, on the pipeline between centrifugal pump 10 and atomizer 8, pressure maintaining valve 9 is set, each atomizer 8 is all through pressure maintaining valve 9 connection centrifugal pumps 10 separately.Centrifugal pump 10 connects again fluid reservoir 11, at fluid reservoir 11, limestone desulfurizer slurries is housed.The atomizing pressure that atomizer 8 is required and slurries are provided by centrifugal pump 10, centrifugal pump 10 is delivered to atomizer 8 by the road by the lime stone slurry in fluid reservoir 11, pressure maintaining valve 9 can guarantee that in slurries supply process, each atomizer 8 has identical pressure, guarantees that all atomizers 8 have identical slurries input.
On fume desulfurating absorption tower 6 left side walls between corona discharge electrode 7 and waste pulp pond 13, have left wind port, this left wind port connects flue gas Corona discharge Treatment chamber 3 by air channel, in flue gas Corona discharge Treatment chamber 3, arista electrode 4 is housed, arista electrode 4 is connected with the positive high voltage electrostatic generator 2 that is positioned at 3 outsides, flue gas Corona discharge Treatment chamber by having the wire of insulation sheath.One section of shaft insulation 16 is coaxially fixed in arista electrode 4 bottoms, by shaft insulation 16, is coaxially fixedly connected with motor 17, and motor 17 is located at the bottom of 3 outsides, flue gas Corona discharge Treatment chamber, and motor 17 rotates to drive arista electrode 4 not stop rotation.
Flue gas Corona discharge Treatment chamber 3 also connects smoke generating appts 1 by pipeline, and on the pipeline of between, mounted valve 15.Contain SO
2the flue gas of gas is produced by smoke generating appts 1, and enters flue gas Corona discharge Treatment chamber 3 by having the pipeline of valve 15.On the right side wall of the fume desulfurating absorption tower 6 between corona discharge electrode 7 and waste pulp pond 13, have right windway port, this right windway port is connected with chimney 12 by air channel, demister 14 is equipped with at chimney 12 tops, to prevent that the flue gas that contains acid drop from entering the external world, avoids causing air pollution.
Referring to Fig. 2, corona discharge electrode 7 horizontal positioned, by ring electrode and needle electrode, formed, uniform several identical needle electrodes along the circumferential direction on the internal ring wall of ring electrode, needle electrode is generally 4-8, and needle electrode radially arranges, all to the central axis direction protrusion of ring electrode, all needle electrodes must maintain a certain distance near this one end of central shaft, in corona discharge process, atomizing medium are punctured preventing.The interior ring diameter of ring electrode is greater than the external diameter of atomizer 8.When corona discharge electrode 7 is connected with negative high voltage electrostatic generator 5, ring electrode part is connected with negative high voltage electrostatic generator 5 by having the wire of insulation sheath.
Structure referring to the arista electrode 4 of Fig. 3, arista electrode 4 is comprised of metal cylinder and raised structures, along metal cylinder axially on, the uniform a plurality of raised structures of gap certain distance, raised structures is the structure that the outer surface from metal cylinder extends radially outward, and the outer ring of raised structures is most advanced and sophisticated.
Equipment shown in Fig. 1 is realized the desulfurization and dedusting of flue gas by following steps: desulfurizer slurry stirs in fluid reservoir 11, open centrifugal pump 10, pressure maintaining valve 9 and negative high voltage electrostatic generator 5, by centrifugal pump 10, extract the lime desulfurization agent slurries that stirred in fluid reservoir 11, desulfurizer slurry is carried to atomizer 8 by pipeline.Pressure maintaining valve 9 guarantees that each atomizer 8 has identical atomizing pressure, and then guarantees that each atomizer 8 has identical flow.In fume desulfurating absorption tower 6, slurries are through atomizer 8 atomizations, by atomizer 8, forming under pressure uniform droplet falls, fall to corona discharge electrode 7, on corona discharge electrode 7, by negative high voltage electrostatic generator 5, be connected with negative high voltage static, when the voltage of corona discharge electrode 7 surpasses certain value, the needle electrode end of corona discharge electrode 7 just forms corona discharge simultaneously, slurries droplet by corona charging district is carried out to corona charging processing, and negative corona discharge is processed.Meanwhile open smoke generating appts 1 and positive high voltage electrostatic generator 2, smoke generating appts 1 produces and contains SO
2the flue gas of gas, opens valve 15, and flue gas enters flue gas Corona discharge Treatment chamber 3 through flue, meanwhile, opens motor 17 and drives arista electrode 4 rotations, utilizes centrifugal action control arista electrode 4 knot ashes, can produce continuously better corona discharge.When positive voltage HV generator 2 is opened to certain voltage, arista electrode 4 can complete containing SO
2the Corona discharge Treatment of flue gas, Corona discharge Treatment has contrary polarity with the Corona discharge Treatment of the slurries droplet that atomizer 8 forms, and is that positive corona discharge is processed.When completing flue gas that positive corona discharge processes and enter fume desulfurating absorption tower 6 through flue, interact with the slurries droplet of processing through negative corona discharge, complete absorption process.In sweetening process, must keep certain calcium sulfur ratio, in slurries, the mol ratio of calcium content and sulfureous in flue gas content is between 1.0～1.1, can reach good assimilation effect.The flue gas absorbing after processing enters chimney 12 through exhaust gases passes, then after demister 14 is processed, discharges atmosphere.Absorb SO in the flue gas after processing
2the slurries droplet of gas falls into the waste pulp pond 13 of fume desulfurating absorption tower bottom, can regularly process.
The present invention is when implementing, and according to the different demands of flue gas desulfurization, atomizer 8 can be replaced by dissimilar nozzle, and the supply mode of slurries can be taked other forms.But no matter supply mode and the atomizer of which kind of slurries, the droplet group who forms after slurry spraying all processes through needle-like corona discharge region, and the droplet after processing with through positive high voltage Corona discharge Treatment containing SO
2the flue gas contact of gas, carries out flue gas desulfurization.In flue gas desulfurization processing procedure, except normal absorption process, at SO
2between gas and slurries droplet, produce additional Coulomb force, be conducive to improve slurries droplet to SO
2the absorbability of gas, improves its mass-transfer efficiency.
Claims (5)
1. a bipolar corona discharge flue gas desulfurization and dedusting equipment, be provided with a fume desulfurating absorption tower (6), it is characterized in that: fume desulfurating absorption tower (6) bottom is that a plurality of atomizers (8) are vertically fixedly equipped with at waste pulp pond (13), top, the upper end of each atomizer (8) all connects and is positioned at the outside centrifugal pump (10) of fume desulfurating absorption tower (6) through a pressure maintaining valve (9), and centrifugal pump (10) connects again the fluid reservoir (11) that desulfurizer slurry is housed; It under each atomizer (8), is the corona discharge electrode (7) of a horizontal positioned, each corona discharge electrode (7) forms by ring electrode and needle electrode, the uniform identical needle electrode that several are radially arranged along the circumferential direction on the internal ring wall of ring electrode, all needle electrodes have gap in this one end near ring electrode central shaft; Between adjacent two corona discharge electrodes (7), there is gap, after all corona discharge electrodes (7) are cascaded, connect and be positioned at the outside negative high voltage electrostatic generator (5) of fume desulfurating absorption tower (6); The left side wall of the fume desulfurating absorption tower (6) between corona discharge electrode (7) and waste pulp pond (13) connects flue gas Corona discharge Treatment chamber (3) by left air channel, flue gas Corona discharge Treatment chamber (3) also connects smoke generating appts (1) by pipeline, arista electrode (4) is housed in flue gas Corona discharge Treatment chamber (3), arista electrode (4) bottom is coaxially fixedly connected with motor (17), and arista electrode (4) is connected through the wire positive high voltage electrostatic generator (2) outside with being positioned at flue gas Corona discharge Treatment chamber (3); Arista electrode (4) is comprised of metal cylinder and raised structures, along axially upper uniform a plurality of raised structures of metal cylinder; The right side wall of the fume desulfurating absorption tower (6) between corona discharge electrode (7) and waste pulp pond (13) is connected with chimney (12) by right air channel.
2. bipolar corona discharge flue gas desulfurization and dedusting equipment according to claim 1, it is characterized in that: demister (14) is arranged at chimney (12) top, on the pipeline between flue gas Corona discharge Treatment chamber (3) and smoke generating appts (1), valve (15) is housed.
3. bipolar corona discharge flue gas desulfurization and dedusting equipment according to claim 1, it is characterized in that: corona discharge electrode (7) is 0～50mm with the vertical range of atomizer (8) lower end, and the interior ring diameter of described ring electrode is greater than the external diameter of atomizer (8).
4. bipolar corona discharge flue gas desulfurization and dedusting equipment according to claim 1, is characterized in that: smoke generating appts (1) produces and contains SO
2the flue gas of gas, fluid reservoir (11) is equipped with limestone desulfurizer slurries, and in desulfurizer slurry, the mol ratio of calcium content and sulfureous in flue gas content is 1.0～1.1.
5. a corona discharge FGD dust collection method for equipment as claimed in claim 1, is characterized in that containing following steps:
A, unlatching centrifugal pump (10), pressure maintaining valve (9) and negative high voltage electrostatic generator (5), fluid reservoir (11) is carried the desulfurizer slurry of identical atomizing pressure to atomizer (8), slurries form uniform slurries droplet and fall through atomizer (8) atomization, corona discharge electrode (7) forms corona discharge simultaneously, and the slurries droplet falling is carried out to negative corona discharge processing;
B, open smoke generating appts (1) and positive high voltage electrostatic generator (2), smoke generating appts (1) generation contain SO
2the flue gas of gas enters flue gas Corona discharge Treatment chamber (3), opens motor (17) simultaneously and drives arista electrode (4) rotation, and arista electrode (4) is to containing SO
2the flue gas of gas carries out positive corona discharge processing, and the flue gas after processing enters fume desulfurating absorption tower (6), interacts with the slurries droplet of processing through negative corona discharge, completes absorption process;
Flue gas after C, absorption is discharged after entering chimney (12), SO in flue gas
2the slurries droplet of gas falls into waste pulp pond (13).
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| CN105108242A (en) * | 2015-08-31 | 2015-12-02 | 广州市美控电子科技有限公司 | Annular multi-point high-frequency high-voltage electrode for waste incineration pollution-free treating system |
| CN108344077A (en) * | 2018-04-02 | 2018-07-31 | 江苏大学 | A kind of intelligence electrostatic atomization air cleaning unit and its method |
| CN110030869A (en) * | 2019-05-20 | 2019-07-19 | 广东览讯科技开发有限公司 | High-pressure electrostatic inhales floating water collector in a kind of cooling stack |
| CN110227317A (en) * | 2019-06-21 | 2019-09-13 | 江苏大学 | A kind of Smoke pollutant treatment device based on electrostatic charged spray |
| CN110404682A (en) * | 2019-09-02 | 2019-11-05 | 宁夏马连富电力科技有限公司 | Dropping liquid dust electric precipitator |
| CN110420755A (en) * | 2019-09-02 | 2019-11-08 | 宁夏马连富电力科技有限公司 | Full liquid dust arrest pole electric dust-collecting device |
| CN115430267A (en) * | 2022-07-22 | 2022-12-06 | 苏州科技大学 | Plasma purification device for purifying catering oil fume and method for purifying catering oil fume |
| CN116213116A (en) * | 2022-09-05 | 2023-06-06 | 苏州科技大学 | Atomization corona oil smoke waste gas purification device and purification method |
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| CN105108242A (en) * | 2015-08-31 | 2015-12-02 | 广州市美控电子科技有限公司 | Annular multi-point high-frequency high-voltage electrode for waste incineration pollution-free treating system |
| CN108344077A (en) * | 2018-04-02 | 2018-07-31 | 江苏大学 | A kind of intelligence electrostatic atomization air cleaning unit and its method |
| CN108344077B (en) * | 2018-04-02 | 2024-04-09 | 江苏大学 | Intelligent electrostatic atomization air purification device and method thereof |
| CN110030869A (en) * | 2019-05-20 | 2019-07-19 | 广东览讯科技开发有限公司 | High-pressure electrostatic inhales floating water collector in a kind of cooling stack |
| CN110030869B (en) * | 2019-05-20 | 2024-02-02 | 广东览讯科技开发有限公司 | High-voltage electrostatic flotation water absorbing device in natural ventilation cooling tower |
| CN110227317A (en) * | 2019-06-21 | 2019-09-13 | 江苏大学 | A kind of Smoke pollutant treatment device based on electrostatic charged spray |
| CN110404682A (en) * | 2019-09-02 | 2019-11-05 | 宁夏马连富电力科技有限公司 | Dropping liquid dust electric precipitator |
| CN110420755A (en) * | 2019-09-02 | 2019-11-08 | 宁夏马连富电力科技有限公司 | Full liquid dust arrest pole electric dust-collecting device |
| CN115430267A (en) * | 2022-07-22 | 2022-12-06 | 苏州科技大学 | Plasma purification device for purifying catering oil fume and method for purifying catering oil fume |
| CN116213116A (en) * | 2022-09-05 | 2023-06-06 | 苏州科技大学 | Atomization corona oil smoke waste gas purification device and purification method |
| CN116213116B (en) * | 2022-09-05 | 2023-09-19 | 苏州科技大学 | Atomization corona oil smoke waste gas purification device containing atomization corona rotating component and purification method |
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